The skeletal and muscular systems of the body work together to produce motions and locomotion of the body. All of these actions are mechanical in nature. They utilize the various mechanics as studied in physics.
The various forces produced by contracting muscles have specific direction and magnitude. As such, these vectors or forces when plotted are represented by arrows whose length corresponds to the magnitude of the force and whose direction corresponds to the direction of the force.
Lever Systems Tab.
The majority of the motions are of the rotary type and occur around an axis or fulcrum. These motions follow the physics of lever systems. The third class of lever is the most common.
Simple Pulley Systems Tab.
Another common mechanism of the human body is the simple pulley system. Here, the direction of force can be at an angle to the muscle.
This is achieved by having the muscle's tendon go around a bony eminence in the same way as a rope goes around a single pulley.
During locomotion, the body uses several pendulums in the swinging of the upper and lower limbs.